I bought a couple of these little chrome speed knobs for my Precision bass, just because I wanted to make the instrument true to the original vintage.
If you are here, maybe you'll know that vintage Precision basses used these specific kind of knobs (which were the same used for Telecaster guitars at the time), instead of the more common types of knobs which are rounder on top. If you are someone who pays attention to the details, these knobs won't disappoint you!